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  1. HamzaNossair

    Bearing issue on a large 25 MW synchrouns Motor

    Hello Everyone, I hope someone can give me some inputs on my following question. 25 MW motor, which has common lube oil system with a compressor and a gear unit. Supplier is saying that we will have as good properties with cylindrical bearings as with 2-lobe bearings.The cylindrical bearing...
  2. HamzaNossair

    Compressor critical speeds

    Hi All: I have a compressor supplier proposing 1500 mm shaft, 125 mm D, tilting pad compressor/ bearing system, runs at 9000 RPM, is it usual and acceptable to have 2 critical speeds below the operating speed and the 3rd above within undamped analysis, and when he run the damped analysis, only...
  3. HamzaNossair

    Compressor critical speed

    Hi All: I have a compressor supplier proposing 1500 mm shaft, 125 mm D, tilting pad compressor/ bearing system, runs at 9000 RPM, is it usual and acceptable to have 2 critical speeds below the operating speed and the 3rd above within undamped analysis, and when he run the damped analysis, only...
  4. HamzaNossair

    Compressor critical speed

    Hi All: I have a compressor supplier proposing 1500 mm shaft, 125 mm D, tilting pad compressor/ bearing system, runs at 9000 RPM, is it usual and acceptable to have 2 critical speeds below the operating speed and the 3rd above within undamped analysis, and when he run the damped analysis, only...
  5. HamzaNossair

    Cent. Compressor Driver Sizing

    Hello everyone, Can each one share his experience over the selection of Centrifugal Compressor Driver size? Fixed Speed Motor, 10% above the Max absorbed POWER? VFD- Motor, should the compressor designed to deliver the Max flow at 105% speed curve? also, shall the Motor and VFD system sized...
  6. HamzaNossair

    Compressor selection

    For a process that can met with either 4 stages Recp Compressor Vs 6 stages Integrally Geared Cent. Compressor, can any one give me an advise with any drawback for each selection? Vibration, capacity control, cost........etc?
  7. HamzaNossair

    Capacity Control Methods

    Hello Gents & ladies: Can anyone advise over the selection of Inelt Guide Vanes Vrs. Inelct suction Throtlling for the Cent. Compressor? how to choose either of them and based on which certain values or aspects you can go either this or this, as our process guys are open on the selection?
  8. HamzaNossair

    centrifugal . Compressor Process Inlet and Outlet orientation?

    Hello: Does anyone know the recommended practice over choosing inlet and outlet piping to a centrifugal Compressor casing weather to be top / Bottom? I know the Maintenance to the Compressor is 1 factor, but I cannot find something firm in the API 617 proving the choice over a certain size of...
  9. HamzaNossair

    Multi-Stage Compressor Issue for LNG

    Hello Everyone, I have LP Casing-MP Casing-HP Casing of Mix Refrigerant Centrifugal Compressors for a LNG Project. I had a problem in the Mid Compressor casing. Vendor quotes a suction pressure of (19.6 bar) for this MP Casing. The Licensor requires (23.77 bar), Also due to this higher MP stage...
  10. HamzaNossair

    Booster Compressor added to exisitng unit Anti Surge Desigb

    Hello, I'm adding a booster compressor to an exisitng cracked gas compressor, which one is the best? 1- Have 1 common Antisurge valve from last stage of exisitng Compressors to the first stage of the booster added, with one pressure controller for the perfromance at the inlet of the new...
  11. HamzaNossair

    Compressors Bearings RTD

    Hello, Can someone verify the preferred bearing instrumentation arrangement? - Two dual element RTD's per bearing, sometimes I heared about two dual element RTD's in the "highest loaded pad" as the specification implies, or a dual element pad in each of the 2 lowest pads I understood that the...
  12. HamzaNossair

    Need your Help- Compressors small bore piping failure

    Hello, Please help me understanding the following:- It appears in my plant when small pipings is connected to large bore piping on the discharge of a rotating equipment, the vibration stress appears to cause fatigue in the welds at the small bores? what is your advise? At what piping size (...
  13. HamzaNossair

    Dry Gas Seal pressure controlled

    Hello folks, On a Dry Gas Seal, which has a diff presure control method, do we need to Alarm and trip on supply, primary? Alarm only on supply, primary? How about secondary seal protection?
  14. HamzaNossair

    Sizing for Air Reciver for Air Compressor

    Hellow everybody? Does any one know who to size an Air Reciver for a 1000 SCFM, 100PSIG Air Compressor? What is the basic requirments?
  15. HamzaNossair

    Check Valve downstream Anti Surge Valve

    Hello Everyone, I have a simple issue, does any one know the reason of installing a check valve downstream the Anit Surge valve? One of our vendors is eleminating that valve thinks that it will cause chock, while after we started that Wet Gas Compressor, we faced some high spill back to the...

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